Problem configuring LIBQMI for quectel UC20

[Dan Williams]

On Thu, 2018-03-08 at 09:21 +0000, LaserIndustries - tec4.ele wrote:
> Good morning,
> 
> I'm experiencing some problems to get work the Quectel UC20 modem
> through QMI wwan interface.
> 
> I followed the manufacturer guide to setup the kernel and I got the
> cdc-qmi.
> This is the system startup log
> $ dmesg | grep wwan
> [    2.198913] usbcore: registered new interface driver qmi_wwan
> [    6.692204] qmi_wwan 1-1:1.4: cdc-wdm0: USB WDM device
> [    6.697773] qmi_wwan 1-1:1.4 wwan0: register 'qmi_wwan' at usb-
> d005e000.usb-1, WWAN/QMI device, 32:33:dd:3b:b1:89
> 
> $ dmesg | grep USB
> [    5.201011] usbserial: USB Serial support registered for GSM modem
> (1-port)
> [    5.214139] usbserial: USB Serial support registered for Qualcomm
> USB modem
> [    6.495066] usb 1-1: new high-speed USB device number 2 using
> orion-ehci
> [    6.642596] usb 1-1: GSM modem (1-port) converter now attached to
> ttyUSB0
> [    6.656162] usb 1-1: GSM modem (1-port) converter now attached to
> ttyUSB1
> [    6.669843] usb 1-1: GSM modem (1-port) converter now attached to
> ttyUSB2
> [    6.683644] usb 1-1: GSM modem (1-port) converter now attached to
> ttyUSB3
> [    6.692204] qmi_wwan 1-1:1.4: cdc-wdm0: USB WDM device
> 
> $ ifconfig wwan0
> wwan0     Link encap:Ethernet  HWaddr 32:33:dd:3b:b1:89
>           BROADCAST MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
> 
> 
> This is when I try to control the interface
> $ sudo qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=online
> [/dev/cdc-wdm0] Operating mode set successfully
> 
> $ sudo qmicli -d /dev/cdc-wdm0 --nas-get-system-info
> [/dev/cdc-wdm0] Successfully got system info:
>                 GSM service:
>                                Status: 'none'
>                                True Status: 'none'
>                                Preferred data path: 'no'
>                 WCDMA service:
>                                Status: 'available'
>                                True Status: 'available'
>                                Preferred data path: 'no'
>                                Domain: 'cs-ps'
>                                Service capability: 'cs-ps'
>                                Roaming status: 'off'
>                                Forbidden: 'no'
>                                Location Area Code: '61324'
>                                Cell ID: '86808460'
>                                MCC: '222'
>                                MNC: '01'
>                                HS call status: 'hsdpa-hsupa-
> unsupported'
>                                HS service: 'hsdpa-hsupa-supported'
>                                Cell broadcast support: 'off'
>                                Call barring status (CS): 'all-calls'
>                                Call barring status (PS): 'all-calls'
>                                Cipher Domain: 'none'
>                 SIM reject info: 'available'
> 
> $ sudo qmicli -d /dev/cdc-wdm0 --wda-get-data-format
> [/dev/cdc-wdm0] Successfully got data format
>                    QoS flow header: no
>                Link layer protocol: '802-3'
>   Uplink data aggregation protocol: 'disabled'
> Downlink data aggregation protocol: 'disabled'
>                      NDP signature: '0'
>   Uplink data aggregation max size: '0'
> Downlink data aggregation max size: '0'
> 
> $ sudo qmicli -d /dev/cdc-wdm0 --set-expected-data-format=raw-ip
> error: cannot set expected data format: Expected data format not
> updated properly: Failed to open file
> '/sys/class/net/wwan0/qmi/raw_ip' for R/W: No such file or directory
> 
> 
> 
> 
> $ sudo qmi-network /dev/cdc-wdm0 start
> Loading profile at /etc/qmi-network.conf...
>     APN: ibox.tim.it
>     APN user: USERNAME1
>     APN password: PASSWORD1
>     qmi-proxy: no
> Checking data format with 'qmicli -d /dev/cdc-wdm0 --wda-get-data-
> format '...
> Device link layer protocol retrieved: 802-3
> Getting expected data format with 'qmicli -d /dev/cdc-wdm0 --get-
> expected-data-format'...
> error: cannot get expected data format: Expected data format not
> retrieved properly: Failed to open file
> '/sys/class/net/wwan0/qmi/raw_ip': No such file or directory
> Expected link layer protocol not retrieved: kernel unsupported
> Device and kernel link layer protocol match: 802-3
> Starting network with 'qmicli -d /dev/cdc-wdm0 --wds-start-
> network=apn='ibox.tim.it',username='USERNAME1',password='PASSWORD1'  
> --client-no-release-cid '...
> error: couldn't start network: QMI protocol error (64): '(null)'

That seems to be:

eQMIErrors_InvalidIPFamilyPreference

so possibly the PDP context QMI is choosing to use based on the APN
you've given isn't an IPv4 one.  Could you grab the output of
"AT+CGDCONT?" from one of the AT ports, with something like "minicom -D
/dev/ttyUSB0"?

Dan

> Saving state at /tmp/qmi-network-state-cdc-wdm0... (CID: 1)
> error: network start failed, no packet data handle
> Clearing state at /tmp/qmi-network-state-cdc-wdm0...
> 
> 
> I can't understand at what level is the problem.. It seems Have a
> problem on the interface configuration?
> 
> Thankyou very much for your suggestion.
> 
> Cordialità,
> Luca Vanzin - Tecnico Elettronico
> Laser Industries
> 
> 
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